i wanted to know if i could use theses with an mp3 player or if they have a cord to plugg into an mp3?

Mine came with an audio jack and an audio input cord to connect to headphone jack on phone or mp3 etc which works (sometime the item is changed by a seller on the same web link on Amazon)

Got a pair of Howard Leight's R-03318 earmuffs and they wouldn't expand enough.. So would these comfortably fit a male adult's large head with a cap?

Well, I have a pair............and a big squash. They seem to fit me ok, and I have a problem with some ball caps being too small.

I lost one of the wind covers on the microphone. Where can I find a replacement?

you might try contacting the company for a replacement

Can the headband be turned 90 degrees to allow wearing a hard hat?

No, the head band won't change position. For a hard-hat with electronic hearing protection, you need to go with something like 3M's Peltor Soundtrap 6Shttps://www.amazon.com/3M-Soundtrap-Tactical-Electronic-Headset/dp/B0000X6I5I/ref=pd_sim_200_3?_encoding=UTF8&pd_rd_i=B0000X6I5I&pd_rd_r=WX4S3Q94VP120VF5Y0YF&pd_rd_w=uy8Qk&pd_rd_wg=8Igf1&psc=1&refRID=WX4S3Q94VP120VF5Y0YF

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Adult Green (Not Lo Pro)

Product ID: 8893536

₩86082

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Sold byAmazon South KoreaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

Caldwell E-Max Hearing Protection Earmuffs with Sound Amplification, Automatic Shut-Off, For Range and Target Shooting

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